Q.

Which of the following is not preferred for electrode making?

A. Ag-AgCl
B. Copper
C. Stainless-steel
D. Gold
Answer» C. Stainless-steel
Explanation: Stainless steel in contact with a saline electrolyte produce a potential difference of 10 mV between the electrodes which is much more than the limit (i.e 2.5 mV). Ad-AgCl electrodes give almost noise free characteristics. They are also found to be acceptable from the point of view of long term drift.
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